• Soak the pistachios in a small bowl covered with water; set aside for 30 minutes.
• Drain the pistachios well and place them on a paper towel to  dry while you assemble the cookie dough.
• Add pistachios to the dough and mix well.
• Divide the dough into two and roll each into a long log, making each log roughly two inches in diameter. Wrap each log in plastic wrap and place in freezer. Once the dough is solid, remove from the freezer and slice into quarter inch slices. If the dough cracks when slicing, allow to thaw a little before continuing to slice.
• Bake on parchment lined cookie sheets 12-13 minutes or until bottom of cookies are slightly brown.
• Dip cookies into melted chocolate and decorate with crushed pistachios. 

For the Cookie Dough Recipe:

• Preheat oven to 350°F.
• Cream the margarine, sugar, egg and vanilla.
• Add the flour and mix till combined.
• Cool cookies on cooling rack.